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Older asphalt surfaces become oxidized from the sun and weather. Oxidation causes the asphalt surface to become brittle, exposing the aggregate.
Coal tar emulsion sealcoating material needs a good, sound surface that it can bond to. If the sealer is applied over exposed aggregate or old, porous and oxidized asphalt surfaces, the sealer will not bond properly. Furthermore, the effects of traffic and weather will cause the improperly bonded sealer to wear prematurely. You would never have your car painted without putting a primer coat on first. Our penetrating primer, in essence, works the same way. Applying Polyprime® leaves a surface that the sealer can bond to.
There are three types of primers:
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• Diluted Coal Tar Sealer
• Diluted Asphalt Emulsion
• Penetrating Primer |
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Diluted Coal Tar or Diluted Asphalt Emulsion do very little more than coat the top surface. Neither of these types of primers has long-term bonding, nor do they penetrate the pores or voids. The dispersed particles of tar or asphalt are too large to get into the surface and must sit on top. These two types of primer will wear quickly due to traffic and weather, and will do very little to improve long-term bonding of the sealer.
Penetrating Primer is a special solution of tar in solvent. It is a multi-polymer/refined coal tar primer specially formulated to improve adhesion of pavement sealer to oxidized asphalt and the exposed stone. Its molecular structure allows it to quickly and effectively get down in the pores of the surface and create a good, sound surface to which the sealer can bond. The primer coats the exposed stone and penetrates the surface. When the solvent evaporates, the surface is coated with tar to which a sealer can be applied and bond to properly. The end result is a much stronger, and less porous pavement. |
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